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Old 12th February 2007, 22:36   #152  |  Link
arnezami
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Join Date: Sep 2006
Posts: 390
Quote:
Originally Posted by xyz987 View Post
Source code please :-)
Some sample code for those eagerly waiting:
Code:
	// Processing Key
	static unsigned char processing_key[16] = {0x09,0xF9,0x11,0x02,0x9D,0x74,0xE3,0x5B,0xD8,0x41,0x56,0xC5,0x63,0x56,0x88,0xC0};

	// Encrypted C Value
	static unsigned char encrypted_c_value[16] = {0x6D,0x02,0xCA,0xC6,0x7B,0x1A,0x7E,0x95,0xC2,0x16,0xEF,0xD4,0xC9,0x28,0x09,0xCF};

	//Decrypted C Value
	static unsigned char decrypted_c_value[16];
	static unsigned char uv[4] = {0x00,0x00,0x00,0x01};

	// Media Key
	static unsigned char media_key[16]; 

	//Encrypted Verification Data (King Kong)
	static unsigned char encrypted_verification_data[16] = {0x87,0xB8,0xA2,0xB7,0xC1,0x0B,0x9F,0xAD,0xF8,0xC4,0x36,0x1E,0x23,0x86,0x59,0xE5};

	//Decrypted Verification Data Should Be
	static unsigned char decrypted_verification_data_should_be[8] = {0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF};

	//Decrypted Verification Data
	static unsigned char decrypted_verification_data[16];

	// Volume ID
	static unsigned char volume_id[16] = {0x40,0x00,0x09,0x18,0x20,0x06,0x08,0x41,0x00,0x20,0x20,0x20,0x20,0x20,0x00,0x00};
	
	//Decrypted Volume ID
	static unsigned char decrypted_volumeid[16];

	//Volume Unique Key
	static unsigned char volume_unqiue_key[16];
	

	// First decrypt the C-value with the processing key
	oRijndael.MakeKey((char *)processing_key, CRijndael::sm_chain0, 16, 16);
	oRijndael.DecryptBlock((char *)encrypted_c_value, (char *)decrypted_c_value);

	// Then XOR it with with the uv (of the corresponding C-value)
	for (j = 0; j < 16; j++)
	{
		if (j < 12)
		{
			media_key[j] = decrypted_c_value[j];
		}
		else
		{
			media_key[j] = decrypted_c_value[j]^uv[j-12];
		}
	}

	// Then check if the resulting media key is correct using the verify media key record
	oRijndael.MakeKey((char *)media_key, CRijndael::sm_chain0, 16, 16);
	oRijndael.DecryptBlock((char *)encrypted_verification_data, (char *)decrypted_verification_data);

	if (!memcmp(decrypted_verification_data_should_be, decrypted_verification_data, 8))
	{
		for (j = 0; j < 16; j++)
		{
			printf("%02X ", decrypted_verification_data[j]);
		}
	}
	printf("\n");

	// Then do a AES-G (basicly a decrypt and an XOR) on the media key + volumeID
	oRijndael.MakeKey((char *)media_key, CRijndael::sm_chain0, 16, 16);
	oRijndael.DecryptBlock((char *)volume_id, (char *)decrypted_volumeid);
	for (j = 0; j < 16; j++)
	{
		volume_unqiue_key[j] = volume_id[j]^decrypted_volumeid[j];
	}
	printf("\n");

	// This results in the Volume Unique Key
	for (j = 0; j < 16; j++)
	{
		printf("%02X ", volume_unqiue_key[j]);
	}
	printf("\n");

Last edited by arnezami; 13th February 2007 at 00:02.
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